Bumper of an automobile



FIG. 1 is a rear view of a bumper of an automobile showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a plan view thereof;

FIG. 5 is a front perspective view thereof; and,

FIG. 6 is a rear perspective view thereof.

The portions of the vehicle shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bumper of an automobile, as shown and described. 